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April 10, 2026Journal of Clinical Orthopaedics and TraumaOpen Access

Comparison of Conversion Unicompartmental Knee Arthroplasties to Primary and Revision Total Knee Arthroplasties: A Gradient of Complexity

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Authors

JLJohnathan R. LexSunnybrook Health Science CentreBEBahar EntezariUniversity of TorontoSTSebastian TomescuSunnybrook Health Science Centre

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Overview

Cohort study compares revision rates and outcomes of UKA to primary and revision TKA, indicating complexity differences.

Key Points

  • This study compares revision rates and clinical outcomes of conversion from UKA to TKA against primary and revision TKAs.
  • Single center cohort study of patients undergoing UKA conversion to TKA from 2012 to 2023.
  • Patients matched 1:1:1 to primary TKAs and revision TKAs based on inclusion criteria.
  • Data collected on surgical details, indications, postoperative outcomes, including revision rates and range of motion.
  • No significant difference in revision rates among UKA to TKA (6.0%), primary TKA (1.0%), and revision TKA (14.0%).
  • Higher reoperation rates in UKA revision compared to primary TKA (p=0.028).
  • Longer operative times for UKA conversion (103.0 min) compared to primary TKA (72.7 min, p<0.001).
  • UKA conversion showed similar range of motion to primary TKA but was superior to revision TKA.

Cite This Study

Lex et al. (2026) studied this question.

synapsesocial.com/papers/69d893a86c1944d70ce04ae9https://doi.org/10.1016/j.jcot.2026.103430
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Conversion of UKA to TKA using identical standard implants—How does it compare to primary UKA, primary TKA and revision TKA?2024 · 4 citations
  2. 2Periprosthetic joint infection risk is comparable between unicompartmental knee arthroplasty to total knee arthroplasty conversion and primary total knee arthroplasty: A systematic review and meta‐analysis2025 · 1 citations
  3. 3Unicompartmental knee arthroplasty revisions to total knee arthroplasty2025 · 4 citations
  4. 4Lower re‐revision rates after UKA‐to‐TKA than UKA‐to‐UKA revision for failed medial unicompartmental knee arthroplasty at mid‐term follow‐up2026
  5. 5Conversion of Unicompartmental to Total Knee Replacement: A Comprehensive Review of Technical Considerations and Surgical Outcomes.2025